If 64 feet of rope weigh 20 pounds, how much will 80 feet of the same type of rope weigh?

Weight of 80 feet rope  = 25 pounds

Step-by-step explanation:

Weight of 64 feet rope = 20 pounds

Weight of 1 feet rope     = 20/64  = 5/16  {giving by 5th table}

Weight of 80 feet rope  = 5 * 80 / 16  

                                        = 5 * 5

                                        = 25 pounds

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step-by-step explanation: